Nice chart Bearisgray!
You can see with it drawn like that how easy it would be to layout the colors going across. That top row starts with a Solid Square and then units that are only 1 corner square with 3 sides of fabric. Then once all the blocks are made and laid out, you would put it together as the diagonal rows.
You would only have to layout 2 of those rows at a time, and set up the 4-patches between them after that. But notice that using the same background fabric means that row is just the same fabric as above it and then below it.
While you are making your subunits, you would make the L+1 blocks, plus 2 each of the contrast and background rectangles that would be combined into the 4-patches.
I don't think it would be as hard to do as first glance even if any written instructions I give are confusing. However, it is amazing how I can pick something up from right next to my sewing machine and sew down the wrong side...
Last edited by Iceblossom; 07-13-2019 at 07:37 AM.